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//
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// the Apache License, Version 2.0 (the "License"); you may not use this 
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// License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software 
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// under the License.
using System;
using System.Collections.Generic;
using ActiveAttributes.Model;
using ActiveAttributes.Utilities;
using Remotion.FunctionalProgramming;

namespace ActiveAttributes.Weaving
{
  public interface ICrosscuttingSorter
  {
    IEnumerable<T> Sort<T> (IEnumerable<T> crosscuttings) where T : class, ICrosscutting;
  }

  public class CrosscuttingSorter : ICrosscuttingSorter
  {
    private readonly CrosscuttingDependencyProvider _crosscuttingDependencyProvider;

    public CrosscuttingSorter (CrosscuttingDependencyProvider crosscuttingDependencyProvider)
    {
      _crosscuttingDependencyProvider = crosscuttingDependencyProvider;
    }

    public IEnumerable<T> Sort<T> (IEnumerable<T> crosscuttings) where T : class, ICrosscutting
    {
      var crosscuttingsAsList = crosscuttings.ConvertToCollection();
      var dependencies = _crosscuttingDependencyProvider.GetDependencies (crosscuttingsAsList);
      return crosscuttingsAsList.TopologicalSort (dependencies, throwIfOrderIsUndefined: true);
    }
  }
}